165631415 has 8 divisors (see below), whose sum is σ = 200726208. Its totient is φ = 131192800.

The previous prime is 165631387. The next prime is 165631421. The reversal of 165631415 is 514136561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165631415 - 2¹⁶ = 165565879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163487 + ... + 164496.

It is an arithmetic number, because the mean of its divisors is an integer number (25090776).

Almost surely, 2^165631415 is an apocalyptic number.

165631415 is a deficient number, since it is larger than the sum of its proper divisors (35094793).

165631415 is a wasteful number, since it uses less digits than its factorization.

165631415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328089.

The product of its digits is 10800, while the sum is 32.

The square root of 165631415 is about 12869.7869057728. The cubic root of 165631415 is about 549.1793988598.

Adding to 165631415 its reverse (514136561), we get a palindrome (679767976).

The spelling of 165631415 in words is "one hundred sixty-five million, six hundred thirty-one thousand, four hundred fifteen".